Cogito, ergo sum - Decartes

"We are what we think. All that we are arises with our thoughts. With
our thoughts, we make our world."
- Sakyamuni Buddha, Dhammapada 2,600 years ago
People back then may not have Sony TVs, or Apple computers, but they
knew the same facts that about psychology that every self-help book
on the shelves of the Borders will tell you.
Decide to live the free and happy life and your stress will be
greatly reduced. Make your mind to success, set goals, follow them,
and you will succeed. Smile at life and to people and they will start
smiling back to you.
Definitely worth trying.